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Introduction to SQL

Introduction to SQL
Which of the following do you need to consider when you make a table in SQL?

Primary keys
All of these
Data types
Default values

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Introduction to SQL
The SQL statementSELECT SUBSTR('123456789', INSTR('abcabcabc', 'b'), 4) FROM DUAL;

1234
6789
2345
456789

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Introduction to SQL
The SELECT statement SELECT 'Hi' FROM DUAL WHERE NULL = NULL; Outputs

Nothing
TRUE
FLASE
Hi

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Introduction to SQL
If you are going to use a combination of three or more AND and OR conditions, it is often easier to use the NOT and NOT IN operators.

False
True

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Introduction to SQL
Which of the following is a SQL aggregate function?

JOIN
LEN
AVG
LEFT

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Introduction to SQL
'AS' clause is used in SQL for

Join operation.
Rename operation.
Projection operation.
Selection operation.

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